diff --git a/XianyuAutoAsync.py b/XianyuAutoAsync.py
index d7fce6b..52132f2 100644
--- a/XianyuAutoAsync.py
+++ b/XianyuAutoAsync.py
@@ -38,6 +38,7 @@ from utils.notification_dispatcher import (
     guess_verification_type,
     render_notification_template,
 )
+from utils.item_pagination import normalize_item_list_page_size
 
 
 MANUAL_VERIFICATION_CONTEXTS = {
@@ -17779,6 +17780,11 @@ class XianyuLive:
             logger.error("获取商品信息失败，重试次数过多")
             return {"error": "获取商品信息失败，重试次数过多"}
 
+        requested_page_size = page_size
+        page_size = normalize_item_list_page_size(page_size)
+        if str(requested_page_size) != str(page_size):
+            logger.warning(f"商品列表每页数量已限制为 {page_size}: requested={requested_page_size}")
+
         # 确保session已创建
         if not self.session:
             await self.create_session()
@@ -17945,6 +17951,7 @@ class XianyuLive:
         Returns:
             dict: 包含所有商品信息的字典
         """
+        page_size = normalize_item_list_page_size(page_size)
         all_items = []
         page_number = 1
         total_saved = 0
diff --git a/reply_server.py b/reply_server.py
index 46f9f85..633affa 100644
--- a/reply_server.py
+++ b/reply_server.py
@@ -35,6 +35,7 @@ from utils.qr_login import qr_login_manager
 from utils.qr_login_lite import qrcode_login_lite
 from utils.xianyu_utils import trans_cookies
 from utils.image_utils import image_manager
+from utils.item_pagination import MAX_ITEM_LIST_PAGE_SIZE
 from utils.product_sku import ProductSkuValidationError, normalize_sku_config
 from utils.time_utils import (
     LOCAL_TIMEZONE,
@@ -10261,7 +10262,7 @@ async def _sync_items_after_publish(
     try:
         page_sync_result = await xianyu_instance.get_item_list_info(
             page_number=1,
-            page_size=100,
+            page_size=MAX_ITEM_LIST_PAGE_SIZE,
             sync_item_details=True,
         )
 
@@ -10270,7 +10271,7 @@ async def _sync_items_after_publish(
 
         if published_item_id and not item_synced:
             fallback_result = await xianyu_instance.get_all_items(
-                page_size=100,
+                page_size=MAX_ITEM_LIST_PAGE_SIZE,
                 max_pages=3,
                 sync_item_details=True,
             )
diff --git a/tests/test_item_pagination.py b/tests/test_item_pagination.py
new file mode 100644
index 0000000..489b48d
--- /dev/null
+++ b/tests/test_item_pagination.py
@@ -0,0 +1,25 @@
+import unittest
+
+from utils.item_pagination import (
+    DEFAULT_ITEM_LIST_PAGE_SIZE,
+    MAX_ITEM_LIST_PAGE_SIZE,
+    normalize_item_list_page_size,
+)
+
+
+class ItemPaginationTests(unittest.TestCase):
+    def test_keeps_supported_page_size(self):
+        self.assertEqual(normalize_item_list_page_size(10), 10)
+        self.assertEqual(normalize_item_list_page_size("20"), 20)
+
+    def test_caps_page_size_at_goofish_limit(self):
+        self.assertEqual(MAX_ITEM_LIST_PAGE_SIZE, 20)
+        self.assertEqual(normalize_item_list_page_size(100), 20)
+
+    def test_normalizes_invalid_page_size(self):
+        self.assertEqual(normalize_item_list_page_size(0), 1)
+        self.assertEqual(normalize_item_list_page_size("invalid"), DEFAULT_ITEM_LIST_PAGE_SIZE)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/utils/item_pagination.py b/utils/item_pagination.py
new file mode 100644
index 0000000..d0ca77f
--- /dev/null
+++ b/utils/item_pagination.py
@@ -0,0 +1,15 @@
+from typing import Any
+
+
+DEFAULT_ITEM_LIST_PAGE_SIZE = 20
+MAX_ITEM_LIST_PAGE_SIZE = 20
+
+
+def normalize_item_list_page_size(value: Any) -> int:
+    """将商品列表分页大小限制在闲鱼网页端接口允许的范围内。"""
+    try:
+        page_size = int(value)
+    except (TypeError, ValueError):
+        page_size = DEFAULT_ITEM_LIST_PAGE_SIZE
+
+    return min(max(page_size, 1), MAX_ITEM_LIST_PAGE_SIZE)